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TM 5-4210-220-12
Table 4-2 UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9a
ANY LIGHT FAILS TO OPERATE - Continued
Step 3
Check harness connections to bulb
a
Replace if broken or severely corroded
b
Tighten connections
Step 4
Trace wire back to switch. Check 12 Vdc on output from switch
a
Replace wire if 12 Vdc at switch but not at lamp end of wire
b
Replace switch if 12 Vdc on input to switch but not on output when switch is ON
Step 5
Trace wire back to circuit breaker
a
Replace wire if breaker output is 12 Vdc but no voltage on switch end of wire
b
Replace breaker if no output from breaker
Step 6
Check ignition or battery bus bar is at 12 Vdc
a
Set ignition switch ON
b
Set battery switch to BOTH
c
Check wiring between batteries and bus bars
d
Recharge batteries
9b
ANY ELECTRICAL GAGE FAILS TO INDICATE
Step 1
Check gage
Replace gage
Step 2
Check sender
Replace sender
Step 3
Check wire between sender and gage for continuity especially at harness plugs
Replace plug or wire
4-42
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